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<a name="gdk-pixbuf-Scaling"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gdk-pixbuf-Scaling.top_of_page"></a>Scaling</span></h2>
<p>Scaling — Scaling pixbufs and scaling and compositing pixbufs</p>
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<div class="refsynopsisdiv">
<a name="gdk-pixbuf-Scaling.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gdk-pixbuf/gdk-pixbuf.h&gt;

enum                <a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType">GdkInterpType</a>;
<a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale-simple" title="gdk_pixbuf_scale_simple ()">gdk_pixbuf_scale_simple</a>             (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale" title="gdk_pixbuf_scale ()">gdk_pixbuf_scale</a>                    (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *dest</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_y</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>);
<a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite-color-simple" title="gdk_pixbuf_composite_color_simple ()">gdk_pixbuf_composite_color_simple</a>   (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> overall_alpha</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_size</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color1</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color2</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite" title="gdk_pixbuf_composite ()">gdk_pixbuf_composite</a>                (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *dest</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_y</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> overall_alpha</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite-color" title="gdk_pixbuf_composite_color ()">gdk_pixbuf_composite_color</a>          (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *dest</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_y</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> overall_alpha</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_size</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color1</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color2</code></em>);
enum                <a class="link" href="gdk-pixbuf-Scaling.html#GdkPixbufRotation" title="enum GdkPixbufRotation">GdkPixbufRotation</a>;
<a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-rotate-simple" title="gdk_pixbuf_rotate_simple ()">gdk_pixbuf_rotate_simple</a>            (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkPixbufRotation" title="enum GdkPixbufRotation"><span class="type">GdkPixbufRotation</span></a> angle</code></em>);
<a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-flip" title="gdk_pixbuf_flip ()">gdk_pixbuf_flip</a>                     (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><span class="type">gboolean</span> horizontal</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Scaling.description"></a><h2>Description</h2>
<p>
The &amp;gdk-pixbuf; contains functions to scale pixbufs, to scale
pixbufs and composite against an existing image, and to scale
pixbufs and composite against a solid color or checkerboard.
Compositing a checkerboard is a common way to show an image with
an alpha channel in image-viewing and editing software.
</p>
<p>
Since the full-featured functions (<a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale" title="gdk_pixbuf_scale ()"><code class="function">gdk_pixbuf_scale()</code></a>,
<a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite" title="gdk_pixbuf_composite ()"><code class="function">gdk_pixbuf_composite()</code></a>, and <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite-color" title="gdk_pixbuf_composite_color ()"><code class="function">gdk_pixbuf_composite_color()</code></a>) are
rather complex to use and have many arguments, two simple
convenience functions are provided, <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale-simple" title="gdk_pixbuf_scale_simple ()"><code class="function">gdk_pixbuf_scale_simple()</code></a> and
<a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite-color-simple" title="gdk_pixbuf_composite_color_simple ()"><code class="function">gdk_pixbuf_composite_color_simple()</code></a> which create a new pixbuf of a
given size, scale an original image to fit, and then return the
new pixbuf.
</p>
<p>
Scaling and compositing functions take advantage of MMX hardware
acceleration on systems where MMX is supported.  If gdk-pixbuf is built
with the Sun mediaLib library, these functions are instead accelerated
using mediaLib, which provides hardware acceleration on Intel, AMD,
and Sparc chipsets.  If desired, mediaLib support can be turned off by
setting the GDK_DISABLE_MEDIALIB environment variable.  
</p>
<p>
The following example demonstrates handling an expose event by
rendering the appropriate area of a source image (which is scaled
to fit the widget) onto the widget's window.  The source image is
rendered against a checkerboard, which provides a visual
representation of the alpha channel if the image has one. If the
image doesn't have an alpha channel, calling
<a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite-color" title="gdk_pixbuf_composite_color ()"><code class="function">gdk_pixbuf_composite_color()</code></a> function has exactly the same effect
as calling <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale" title="gdk_pixbuf_scale ()"><code class="function">gdk_pixbuf_scale()</code></a>.
</p>
<p>
</p>
<div class="example">
<a name="id474078"></a><p class="title"><b>Example 2. Handling an expose event.</b></p>
<div class="example-contents">
<p>
</p>
<pre class="programlisting">
gboolean
expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
  GdkPixbuf *dest;

  dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, event-&gt;area.width, event-&gt;area.height);

  gdk_pixbuf_composite_color (pixbuf, dest,
                              0, 0, event-&gt;area.width, event-&gt;area.height,
                              -event-&gt;area.x, -event-&gt;area.y,
                              (double) widget-&gt;allocation.width / gdk_pixbuf_get_width (pixbuf),
                              (double) widget-&gt;allocation.height / gdk_pixbuf_get_height (pixbuf),
                              GDK_INTERP_BILINEAR, 255,
                              event-&gt;area.x, event-&gt;area.y, 16, 0xaaaaaa, 0x555555);

  gdk_draw_pixbuf (widget-&gt;window, widget-&gt;style-&gt;fg_gc[GTK_STATE_NORMAL], dest,
                   0, 0, event-&gt;area.x, event-&gt;area.y,
                   event-&gt;area.width, event-&gt;area.height,
                   GDK_RGB_DITHER_NORMAL, event-&gt;area.x, event-&gt;area.y);
  
  gdk_pixbuf_unref (dest);
  
  return TRUE;
}
</pre>
<p>
</p>
</div>
</div>
<p><br class="example-break">
</p>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Scaling.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GdkInterpType"></a><h3>enum GdkInterpType</h3>
<pre class="programlisting">typedef enum {
	GDK_INTERP_NEAREST,
	GDK_INTERP_TILES,
	GDK_INTERP_BILINEAR,
	GDK_INTERP_HYPER
} GdkInterpType;
</pre>
<p>
This enumeration describes the different interpolation modes that
 can be used with the scaling functions. <em class="parameter"><code>GDK_INTERP_NEAREST</code></em> is 
 the fastest scaling method, but has horrible quality when 
 scaling down. <em class="parameter"><code>GDK_INTERP_BILINEAR</code></em> is the best choice if you 
 aren't sure what to choose, it has a good speed/quality balance.
</p>
<p>
 </p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
	Cubic filtering is missing from the list; hyperbolic
	interpolation is just as fast and results in higher quality.
 </div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GDK-INTERP-NEAREST:CAPS"></a><span class="term"><code class="literal">GDK_INTERP_NEAREST</code></span></p></td>
<td>Nearest neighbor sampling; this is the fastest
 and lowest quality mode. Quality is normally unacceptable when scaling 
 down, but may be OK when scaling up.
</td>
</tr>
<tr>
<td><p><a name="GDK-INTERP-TILES:CAPS"></a><span class="term"><code class="literal">GDK_INTERP_TILES</code></span></p></td>
<td>This is an accurate simulation of the PostScript
 image operator without any interpolation enabled.  Each pixel is
 rendered as a tiny parallelogram of solid color, the edges of which
 are implemented with antialiasing.  It resembles nearest neighbor for
 enlargement, and bilinear for reduction.
</td>
</tr>
<tr>
<td><p><a name="GDK-INTERP-BILINEAR:CAPS"></a><span class="term"><code class="literal">GDK_INTERP_BILINEAR</code></span></p></td>
<td>Best quality/speed balance; use this mode by
 default. Bilinear interpolation.  For enlargement, it is
 equivalent to point-sampling the ideal bilinear-interpolated image.
 For reduction, it is equivalent to laying down small tiles and
 integrating over the coverage area.
</td>
</tr>
<tr>
<td><p><a name="GDK-INTERP-HYPER:CAPS"></a><span class="term"><code class="literal">GDK_INTERP_HYPER</code></span></p></td>
<td>This is the slowest and highest quality
 reconstruction function. It is derived from the hyperbolic filters in
 Wolberg's "Digital Image Warping", and is formally defined as the
 hyperbolic-filter sampling the ideal hyperbolic-filter interpolated
 image (the filter is designed to be idempotent for 1:1 pixel mapping).
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-scale-simple"></a><h3>gdk_pixbuf_scale_simple ()</h3>
<pre class="programlisting"><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         gdk_pixbuf_scale_simple             (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>);</pre>
<p>
Create a new <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> containing a copy of <em class="parameter"><code>src</code></em> scaled to
<em class="parameter"><code>dest_width</code></em> x <em class="parameter"><code>dest_height</code></em>. Leaves <em class="parameter"><code>src</code></em> unaffected.  <em class="parameter"><code>interp_type</code></em>
should be <a class="link" href="gdk-pixbuf-Scaling.html#GDK-INTERP-NEAREST:CAPS"><span class="type">GDK_INTERP_NEAREST</span></a> if you want maximum speed (but when
scaling down <a class="link" href="gdk-pixbuf-Scaling.html#GDK-INTERP-NEAREST:CAPS"><span class="type">GDK_INTERP_NEAREST</span></a> is usually unusably ugly).  The
default <em class="parameter"><code>interp_type</code></em> should be <a class="link" href="gdk-pixbuf-Scaling.html#GDK-INTERP-BILINEAR:CAPS"><span class="type">GDK_INTERP_BILINEAR</span></a> which offers
reasonable quality and speed.
</p>
<p>
You can scale a sub-portion of <em class="parameter"><code>src</code></em> by creating a sub-pixbuf
pointing into <em class="parameter"><code>src</code></em>; see <a class="link" href="gdk-pixbuf-Image-Data-in-Memory.html#gdk-pixbuf-new-subpixbuf" title="gdk_pixbuf_new_subpixbuf ()"><code class="function">gdk_pixbuf_new_subpixbuf()</code></a>.
</p>
<p>
For more complicated scaling/compositing see <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale" title="gdk_pixbuf_scale ()"><code class="function">gdk_pixbuf_scale()</code></a>
and <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite" title="gdk_pixbuf_composite ()"><code class="function">gdk_pixbuf_composite()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_width</code></em> :</span></p></td>
<td>the width of destination image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_height</code></em> :</span></p></td>
<td>the height of destination image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interp_type</code></em> :</span></p></td>
<td>the interpolation type for the transformation.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>, or <a href="/home/mclasen/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a> if not enough memory could be
allocated for it. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-scale"></a><h3>gdk_pixbuf_scale ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gdk_pixbuf_scale                    (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *dest</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_y</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>);</pre>
<p>
Creates a transformation of the source image <em class="parameter"><code>src</code></em> by scaling by
<em class="parameter"><code>scale_x</code></em> and <em class="parameter"><code>scale_y</code></em> then translating by <em class="parameter"><code>offset_x</code></em> and <em class="parameter"><code>offset_y</code></em>,
then renders the rectangle (<em class="parameter"><code>dest_x</code></em>, <em class="parameter"><code>dest_y</code></em>, <em class="parameter"><code>dest_width</code></em>,
<em class="parameter"><code>dest_height</code></em>) of the resulting image onto the destination image
replacing the previous contents.
</p>
<p>
Try to use <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale-simple" title="gdk_pixbuf_scale_simple ()"><code class="function">gdk_pixbuf_scale_simple()</code></a> first, this function is
the industrial-strength power tool you can fall back to if
<a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-scale-simple" title="gdk_pixbuf_scale_simple ()"><code class="function">gdk_pixbuf_scale_simple()</code></a> isn't powerful enough.
</p>
<p>
If the source rectangle overlaps the destination rectangle on the
same pixbuf, it will be overwritten during the scaling which
results in rendering artifacts.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>the <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> into which to render the results</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_x</code></em> :</span></p></td>
<td>the left coordinate for region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_y</code></em> :</span></p></td>
<td>the top coordinate for region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_width</code></em> :</span></p></td>
<td>the width of the region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_height</code></em> :</span></p></td>
<td>the height of the region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset_x</code></em> :</span></p></td>
<td>the offset in the X direction (currently rounded to an integer)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset_y</code></em> :</span></p></td>
<td>the offset in the Y direction (currently rounded to an integer)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>scale_x</code></em> :</span></p></td>
<td>the scale factor in the X direction</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>scale_y</code></em> :</span></p></td>
<td>the scale factor in the Y direction</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interp_type</code></em> :</span></p></td>
<td>the interpolation type for the transformation.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-composite-color-simple"></a><h3>gdk_pixbuf_composite_color_simple ()</h3>
<pre class="programlisting"><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         gdk_pixbuf_composite_color_simple   (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> overall_alpha</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_size</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color1</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color2</code></em>);</pre>
<p>
Creates a new <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> by scaling <em class="parameter"><code>src</code></em> to <em class="parameter"><code>dest_width</code></em> x
<em class="parameter"><code>dest_height</code></em> and compositing the result with a checkboard of colors
<em class="parameter"><code>color1</code></em> and <em class="parameter"><code>color2</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_width</code></em> :</span></p></td>
<td>the width of destination image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_height</code></em> :</span></p></td>
<td>the height of destination image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interp_type</code></em> :</span></p></td>
<td>the interpolation type for the transformation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>overall_alpha</code></em> :</span></p></td>
<td>overall alpha for source image (0..255)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>check_size</code></em> :</span></p></td>
<td>the size of checks in the checkboard (must be a power of two)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>color1</code></em> :</span></p></td>
<td>the color of check at upper left</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>color2</code></em> :</span></p></td>
<td>the color of the other check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>, or <a href="/home/mclasen/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a> if not enough memory could be
allocated for it. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-composite"></a><h3>gdk_pixbuf_composite ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gdk_pixbuf_composite                (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *dest</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_y</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> overall_alpha</code></em>);</pre>
<p>
Creates a transformation of the source image <em class="parameter"><code>src</code></em> by scaling by
<em class="parameter"><code>scale_x</code></em> and <em class="parameter"><code>scale_y</code></em> then translating by <em class="parameter"><code>offset_x</code></em> and <em class="parameter"><code>offset_y</code></em>.
This gives an image in the coordinates of the destination pixbuf.
The rectangle (<em class="parameter"><code>dest_x</code></em>, <em class="parameter"><code>dest_y</code></em>, <em class="parameter"><code>dest_width</code></em>, <em class="parameter"><code>dest_height</code></em>)
is then composited onto the corresponding rectangle of the
original destination image.
</p>
<p>
When the destination rectangle contains parts not in the source 
image, the data at the edges of the source image is replicated
to infinity. 
</p>
<p>
</p>
<div class="figure">
<a name="pixbuf-composite-diagram"></a><p class="title"><b>Figure 1. Compositing of pixbufs</b></p>
<div class="figure-contents"><div><img src="composite.png" alt="Compositing of pixbufs"></div></div>
</div>
<p><br class="figure-break">
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>the <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> into which to render the results</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_x</code></em> :</span></p></td>
<td>the left coordinate for region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_y</code></em> :</span></p></td>
<td>the top coordinate for region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_width</code></em> :</span></p></td>
<td>the width of the region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_height</code></em> :</span></p></td>
<td>the height of the region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset_x</code></em> :</span></p></td>
<td>the offset in the X direction (currently rounded to an integer)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset_y</code></em> :</span></p></td>
<td>the offset in the Y direction (currently rounded to an integer)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>scale_x</code></em> :</span></p></td>
<td>the scale factor in the X direction</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>scale_y</code></em> :</span></p></td>
<td>the scale factor in the Y direction</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interp_type</code></em> :</span></p></td>
<td>the interpolation type for the transformation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>overall_alpha</code></em> :</span></p></td>
<td>overall alpha for source image (0..255)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-composite-color"></a><h3>gdk_pixbuf_composite_color ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gdk_pixbuf_composite_color          (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *dest</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_width</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> dest_height</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> offset_y</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_x</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> scale_y</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkInterpType" title="enum GdkInterpType"><span class="type">GdkInterpType</span></a> interp_type</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> overall_alpha</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_x</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_y</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> check_size</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color1</code></em>,
                                                         <em class="parameter"><code><span class="type">guint32</span> color2</code></em>);</pre>
<p>
Creates a transformation of the source image <em class="parameter"><code>src</code></em> by scaling by
<em class="parameter"><code>scale_x</code></em> and <em class="parameter"><code>scale_y</code></em> then translating by <em class="parameter"><code>offset_x</code></em> and <em class="parameter"><code>offset_y</code></em>,
then composites the rectangle (<em class="parameter"><code>dest_x</code></em> ,<em class="parameter"><code>dest_y</code></em>, <em class="parameter"><code>dest_width</code></em>,
<em class="parameter"><code>dest_height</code></em>) of the resulting image with a checkboard of the
colors <em class="parameter"><code>color1</code></em> and <em class="parameter"><code>color2</code></em> and renders it onto the destination
image.
</p>
<p>
See <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-composite-color-simple" title="gdk_pixbuf_composite_color_simple ()"><code class="function">gdk_pixbuf_composite_color_simple()</code></a> for a simpler variant of this
function suitable for many tasks.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>the <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> into which to render the results</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_x</code></em> :</span></p></td>
<td>the left coordinate for region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_y</code></em> :</span></p></td>
<td>the top coordinate for region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_width</code></em> :</span></p></td>
<td>the width of the region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dest_height</code></em> :</span></p></td>
<td>the height of the region to render</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset_x</code></em> :</span></p></td>
<td>the offset in the X direction (currently rounded to an integer)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offset_y</code></em> :</span></p></td>
<td>the offset in the Y direction (currently rounded to an integer)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>scale_x</code></em> :</span></p></td>
<td>the scale factor in the X direction</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>scale_y</code></em> :</span></p></td>
<td>the scale factor in the Y direction</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interp_type</code></em> :</span></p></td>
<td>the interpolation type for the transformation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>overall_alpha</code></em> :</span></p></td>
<td>overall alpha for source image (0..255)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>check_x</code></em> :</span></p></td>
<td>the X offset for the checkboard (origin of checkboard is at -<em class="parameter"><code>check_x</code></em>, -<em class="parameter"><code>check_y</code></em>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>check_y</code></em> :</span></p></td>
<td>the Y offset for the checkboard</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>check_size</code></em> :</span></p></td>
<td>the size of checks in the checkboard (must be a power of two)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>color1</code></em> :</span></p></td>
<td>the color of check at upper left</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>color2</code></em> :</span></p></td>
<td>the color of the other check</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GdkPixbufRotation"></a><h3>enum GdkPixbufRotation</h3>
<pre class="programlisting">typedef enum {
	GDK_PIXBUF_ROTATE_NONE             =   0,
	GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE =  90,
	GDK_PIXBUF_ROTATE_UPSIDEDOWN       = 180,
	GDK_PIXBUF_ROTATE_CLOCKWISE        = 270
} GdkPixbufRotation;
</pre>
<p>
The possible rotations which can be passed to <a class="link" href="gdk-pixbuf-Scaling.html#gdk-pixbuf-rotate-simple" title="gdk_pixbuf_rotate_simple ()"><code class="function">gdk_pixbuf_rotate_simple()</code></a>.
To make them easier to use, their numerical values are the actual degrees.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GDK-PIXBUF-ROTATE-NONE:CAPS"></a><span class="term"><code class="literal">GDK_PIXBUF_ROTATE_NONE</code></span></p></td>
<td>No rotation.
</td>
</tr>
<tr>
<td><p><a name="GDK-PIXBUF-ROTATE-COUNTERCLOCKWISE:CAPS"></a><span class="term"><code class="literal">GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE</code></span></p></td>
<td>Rotate by 90 degrees.
</td>
</tr>
<tr>
<td><p><a name="GDK-PIXBUF-ROTATE-UPSIDEDOWN:CAPS"></a><span class="term"><code class="literal">GDK_PIXBUF_ROTATE_UPSIDEDOWN</code></span></p></td>
<td>Rotate by 180 degrees.
</td>
</tr>
<tr>
<td><p><a name="GDK-PIXBUF-ROTATE-CLOCKWISE:CAPS"></a><span class="term"><code class="literal">GDK_PIXBUF_ROTATE_CLOCKWISE</code></span></p></td>
<td>Rotate by 270 degrees.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-rotate-simple"></a><h3>gdk_pixbuf_rotate_simple ()</h3>
<pre class="programlisting"><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         gdk_pixbuf_rotate_simple            (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gdk-pixbuf-Scaling.html#GdkPixbufRotation" title="enum GdkPixbufRotation"><span class="type">GdkPixbufRotation</span></a> angle</code></em>);</pre>
<p>
Rotates a pixbuf by a multiple of 90 degrees, and returns the
result in a new pixbuf.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>angle</code></em> :</span></p></td>
<td>the angle to rotate by</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>, or <a href="/home/mclasen/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a> if not enough memory could be
allocated for it. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.6</p>
</div>
<hr>
<div class="refsect2">
<a name="gdk-pixbuf-flip"></a><h3>gdk_pixbuf_flip ()</h3>
<pre class="programlisting"><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> *         gdk_pixbuf_flip                     (<em class="parameter"><code>const <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *src</code></em>,
                                                         <em class="parameter"><code><span class="type">gboolean</span> horizontal</code></em>);</pre>
<p>
Flips a pixbuf horizontally or vertically and returns the
result in a new pixbuf.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>horizontal</code></em> :</span></p></td>
<td>
<code class="literal">TRUE</code> to flip horizontally, <code class="literal">FALSE</code> to flip vertically</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a>, or <a href="/home/mclasen/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a> if not enough memory could be
allocated for it. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.6</p>
</div>
</div>
<div class="refsect1">
<a name="gdk-pixbuf-Scaling.see-also"></a><h2>See Also</h2>
GdkRGB.
</div>
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